PDF | Impulse turbine has been constructed to be used in the program of Hydraulic Machines, Faculty of Mechanical Engineering at the. The purpose of this experiment is to revise the concepts of turbine cycle, its practical is classified as a “simple, single stage, axial flow, impulse turbine”. The impulse shows the total result of applying force. Impulse turbine works on the same principle. It is mostly used at high heads. Today we will.

Impulse Turbine Pdf

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existing impulse turbine, a one-stage turbine set in an organic Rankine cycle Turbine blades, and hence turbines having these types of blades, are classified as impulse or reaction. When moving blades are driven entirely by the impact of. “Turbine” is a general term for any device that extracts mechanical energy from a There are two main types of dynamic turbines: impulse turbines and reaction.

The steam velocity increases The volume of the steam increases. In nozzles, the pressure energy of the steam is converted into kinetic energy. They are two types of nozzles used in the steam turbine.

If the exit pressure is less than 0. The Convergent-divergent Nozzles The convergent-divergent nozzles prevent eddy currents and the calculated velocity will be obtained even at large pressure drops.

The purpose of the bucket or moving blade on the rotor is to convert the kinetic energy of the steam into mechanical energy.

The Impulse Principle The steam at high pressure enters through a stationary nozzle of a steam turbine, as a result the pressure of the steam is decrease and an increase in steam velocity.

As a result of increased steam velocity steam pass through the nozzle in the form of a high-speed jet. This high-velocity steam hit the properly shaped turbine blade, as a result, the steam flow direction is changed.

Comparison between Impulse Turbine and Reaction Turbine

The effect of this change in direction of the steam flow will produce an impulse force. This force cause the blade move, thereby the rotor will start to rotate.

The change of momentum produces the impulse force. Impulse Turbine Working: In the impulse turbine pressure drops and the velocity increases as the steam passes through the nozzles.

When the steam passes through the moving blades the velocity drops but the pressure remains the same.

Impulse Turbine:

The fact that the pressure does not drop across the moving blades is the distinguishing feature of the impulse turbine. The pressure at the inlet of the moving blades is same as the pressure at the outlet of moving blades. Reaction Turbine Principle: In the case of reaction turbine, the moving blades of a turbine are shaped in such a way that the steam expands and drops in pressure as it passes through them. The term impulse means sudden force act to bring desire change. It denote as product of force and time interval for which it acts.

The impulse shows the total result of applying force. Impulse turbine works on the same principle.

It is mostly used at high heads. Today we will learn about principle, construction and working of impulse turbine. Impulse Turbine: Principle: Impulse turbine works on the basic principle of impulse.

Compounding of steam turbines

When the jet of water strikes at the turbine blade with full of its speed, it generates a large force which used to rotate the turbine. The force is depends on the time interval and velocity of jet strikes the blades.

This turbine used to rotate the generator, which produces electric power. They are concave in shape.

The water jet strikes at the blades and change the direction of it. The force exerted on blades depends upon amount of change in direction of jet.

So the blades are generally concave in shape. Rotor: Rotor which is also known as wheel is situated on the shaft.The steam from the boilers enters from the right at high pressure through a throttle , controlled manually by an operator in this case a sailor known as the throttleman.

It only serves to prevent splashing and guide water to the tail race. Your email address will not be published.

This arrangement is common in low-pressure casings of a compound turbine. Water is admitted over the entire circumference of the runner.